Sound-reproducing machine



Nov. 4, 1930. NI JE 1,780,194

SOUND REPRODUCING MACHINE Filed May 3. 1929 Gzaea: A ENDE I N V EN TOR.

A TTORNEY.

Patented Nov. 4, 1930 UNITED STATES PATENT OFFICE GEORGE KENDE, OF EAST ORANGE, NEWJERSEY ASSIGNOR TO PHONODISC CORPORA- 'I'ION, OF NEW YORK, N. Y.

SOUND-REPRODUGING MACHINE Application filed May 3, 1929.

In the operation of sound reproducing machines in conjunction with motion picture projectors in the production of synchronized motion pictures the sound record turntables are usually rather heavy; and after they have been started considerable momentum results, and as the force is applied the speed of the mass of the rotating turntable tends to accelerate. t is therefore the object of the present invention to prevent or retard this acceleration so that the turntable will be maintained in step and will be quickly halted when the rotating power has been cut off.

In order to do this, several constructions may be resorted to, but in order that the idea may be readily understood and its advantages fully appreciated, attention is invited to the accompanying drawings, in which Figure 1 is a section through a turntable of a sound reproducing machine with the invention applied.

Figure 2 is a section on line 2-2 of Figure 1.

Figure 3 is a'section on line 3-3 of Figure 1.

Referring to the drawings, the 4 designates the turntable which is mounted and driven as is customary, but is provided with the annular brake surface 5 underneath and near the periphery thereof.

A fixed support 6 is mounted to carry the two fixed diametrically disposed arms 7, each of which is provided with a bore 8 adjacent the free end thereof and directly below the surface 5. A pin 9 is slidably mounted and guided in this bore, and carries a casing 10, for the brake disk or pad 11, which may be of any desired material, as leather, brake material, or felt A spring 12 resiliently holds the pad frictionally against the surface 5, and as two are employed the braking efiect is applied at two diametrically opposite points.

It will thus be seen that inasmuch as the braking effect is applied at all times by the weak spring 12, any tendency to accelerate or move the turntable will be retarded and that When the turntable is halted the braking pads will bring it to a quick stop.

What I claim, is

Serial No. 360,126.

1. The combination with a sound record turntable having an annular braking surface, of a plurality of fixed arms disposed below and adjacent to the turntable, and a resiliently pressed brake member carried by each arm and in contact with the braking surface.

2. The combination as claimed in claim 1, in which each brake member consists of a pin, a cap carried by the pin, a bra ing pad carried by the cap, and a spring mounted upon the pin and resiliently holding the cap and pad toward the turntable.

In testimony whereof I affix my signature.

GEORGE KENDE. 

